Method FastSetBlock

src/Chunk.cpp:1511–1574

void cChunk::FastSetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_BlockType, BLOCKTYPE a_BlockMeta)
{
	ASSERT(!((a_RelX < 0) || (a_RelX >= Width) || (a_RelY < 0) || (a_RelY >= Height) || (a_RelZ < 0) || (a_RelZ >= Width)));

	ASSERT(IsValid());
	
	const int index = MakeIndexNoCheck(a_RelX, a_RelY, a_RelZ);
	const BLOCKTYPE OldBlockType = cChunkDef::GetBlock(m_BlockTypes, index);
	const BLOCKTYPE OldBlockMeta = GetNibble(m_BlockMeta, index);
	if ((OldBlockType == a_BlockType) && (OldBlockMeta == a_BlockMeta))
	{
		return;
	}

	MarkDirty();
	
	m_BlockTypes[index] = a_BlockType;

	// The client doesn't need to distinguish between stationary and nonstationary fluids:
	if (
		(OldBlockMeta != a_BlockMeta) ||  // Different meta always gets sent to the client
		!(
			((OldBlockType == E_BLOCK_STATIONARY_WATER) && (a_BlockType == E_BLOCK_WATER)) ||             // Replacing stationary water with water
			((OldBlockType == E_BLOCK_WATER)            && (a_BlockType == E_BLOCK_STATIONARY_WATER)) ||  // Replacing water with stationary water
			((OldBlockType == E_BLOCK_STATIONARY_LAVA)  && (a_BlockType == E_BLOCK_LAVA)) ||              // Replacing stationary water with water
			((OldBlockType == E_BLOCK_LAVA)             && (a_BlockType == E_BLOCK_STATIONARY_LAVA))      // Replacing water with stationary water
		)
	)
	{
		m_PendingSendBlocks.push_back(sSetBlock(m_PosX, m_PosZ, a_RelX, a_RelY, a_RelZ, a_BlockType, a_BlockMeta));
	}
	
	SetNibble(m_BlockMeta, index, a_BlockMeta);

	// ONLY recalculate lighting if it's necessary!
	if (
		(cBlockInfo::GetLightValue        (OldBlockType) != cBlockInfo::GetLightValue        (a_BlockType)) ||
		(cBlockInfo::GetSpreadLightFalloff(OldBlockType) != cBlockInfo::GetSpreadLightFalloff(a_BlockType)) ||
		(cBlockInfo::IsTransparent        (OldBlockType) != cBlockInfo::IsTransparent        (a_BlockType))
	)
	{
		m_IsLightValid = false;
	}

	// Update heightmap, if needed:
	if (a_RelY >= m_HeightMap[a_RelX + a_RelZ * Width])
	{
		if (a_BlockType != E_BLOCK_AIR)
		{
			m_HeightMap[a_RelX + a_RelZ * Width] = (unsigned char)a_RelY;
		}
		else
		{
			for (int y = a_RelY - 1; y > 0; --y)
			{
				if (m_BlockTypes[MakeIndexNoCheck(a_RelX, y, a_RelZ)] != E_BLOCK_AIR)
				{
					m_HeightMap[a_RelX + a_RelZ * Width] = (unsigned char)y;